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Method of simultaneously dephosphorus desulfur of chromium containing molten iron using barium carbonate slag material

A barium carbonate and slag technology, applied in the direction of improving process efficiency, can solve the problems of difficult dephosphorization of molten iron, chromium burning loss, etc., and achieve the effects of reducing processing procedures, saving processing costs, and reducing investment

Inactive Publication Date: 2007-04-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the current problems of difficult dephosphorization of molten iron containing chromium (2% to 10%), serious burning loss of chromium and the need for two-step dephosphorization and desulfurization of molten iron pretreatment. Simultaneous dephosphorization and desulfurization method of molten chrome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The amount of chromium-containing pig iron is 200 grams, the amount of barium carbonate-based slag is 10% of the chromium-containing pig iron, that is, 20 grams, and the slag contains 50% BaCO 3 , 45% FeO and 5% Cr 2 o 3 . In the silicon-molybdenum high-temperature furnace, in the atmospheric atmosphere at 1420°C, the chromium-containing pig iron containing 0.06% phosphorus, 4.54% chromium and 0.035% sulfur is simultaneously dephosphorized and desulfurized. The slag is added in two batches with an interval of 2 minutes. The processing time was 30 minutes, and the results are shown in Table 1.

[0019] Element,%

Embodiment 2

[0021] The amount of chromium-containing pig iron is 200 grams, the amount of barium carbonate-based slag is 10% of the amount of chromium-containing pig iron, that is, 20 grams, and the slag is 100% BaCO 3 . In the silicon-molybdenum high-temperature furnace, in the atmospheric atmosphere at 1420°C, the chromium-containing pig iron containing 0.06% phosphorus, 4.54% chromium and 0.035% sulfur is simultaneously dephosphorized and desulfurized. The slag is added in two batches with an interval of 2 minutes. The processing time was 30 minutes, and the results are shown in Table 2.

[0022] Element,%

Embodiment 3

[0024] The amount of chromium-containing pig iron is 200 grams, the amount of barium carbonate-based slag is 10% of the amount of chromium-containing pig iron, that is, 20 grams, and the slag is 100% BaCO 3 . In the medium frequency induction furnace, melt the chromium-containing pig iron containing 0.08% phosphorus, 5% chromium, and 0.035% sulfur. After visual inspection, add BaCO continuously 3 , stirring continuously, sampling and testing after 10 minutes, the results are shown in Table 3.

[0025] Element,%

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PUM

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Abstract

The invention offers a method to desulfurate and dephosphorize simultaneously for chromate liquid steel with slag charges of barium carbonate, which belongs to the field of preprocessing for liquid steel of metallurgical industry. In this method, deoxidated and chromate pig irons are heated in high temperature furnace or medium-frequency induction furnace under normal atmosphere and air atmosphere. Quantity of additional slag charges of barium carbonate is 10% of chromate pig irons. The slag charges of barium carbonate is prepared with BaCO3-FeO-Cr2O3. The proportion of various components can be adjusted according to phosphate sulfur requirement of different steel grades. This method can desulfurate and dephosphorize simultaneously. Phosphate can be deaminated stably under 0.02%, and sulfur can be deaminated stably under 0.008% with a small burning loss of chromium.

Description

Technical field: [0001] The invention belongs to the field of pretreatment of molten iron in the metallurgical industry, and specifically relates to a method for simultaneously dephosphorizing and desulfurizing molten iron containing chromium by using barium carbonate slag material with high phosphorus and sulfur capacity, which can simultaneously reduce phosphorus and sulfur to a relatively low level, thereby providing a better environment for production. Stainless steel or other high-quality steel provides condition. Background technique: [0002] my country's crude steel output has exceeded 300 million tons, but the ratio of high-quality steel to ordinary steel needs to be improved. The inclusion of phosphorus and sulfur in steel has great harm to the performance of steel. For pure steel, five elements of S, P, O, N, and H are required. content and less than 100ppm. At present, the pretreatment of molten iron in my country is mainly used for desulfurization, and dephospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04C21C7/064C21C7/076
CPCY02P10/20
Inventor 王世俊刘丽霞王泉张峰彭军
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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